android中Activity兑现再按一次退出_Android

android中Activity实现再按一次退出

Exit exit = new Exit();      @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {      if (keyCode == KeyEvent.KEYCODE_BACK) {              pressAgainExit();              return true;              }        return super.onKeyDown(keyCode, event);    }    private void pressAgainExit() {          if (exit.isExit()) {              finish();          } else {              Toast.makeText(getApplicationContext(), "再按一次退出程序",                      1000).show();              exit.doExitInOneSecond();          }      }

辅助类Exit.java

package com.chen.b;import android.os.Handler;import android.os.HandlerThread;public class Exit { private boolean isExit = false; private Runnable task = new Runnable() { @Override public void run() { isExit = false; } }; public void doExitInOneSecond() { isExit = true; HandlerThread thread = new HandlerThread("doTask"); thread.start(); new Handler(thread.getLooper()).postDelayed(task, 1000); } public boolean isExit() { return isExit; } public void setExit(boolean isExit) { this.isExit = isExit; } }